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Dose Measurements

Dose Measurements. S. Roesler (DGS-RP). Collimation WG – IR3 passive absorbers 4 June 2012. Outline. - Measurements 1) Ambient dose equivalent manual radiation survey (AD6 survey instrument), TS1 25/04/12 PMI readings 2) Absorbed dose

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Dose Measurements

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  1. Dose Measurements S. Roesler (DGS-RP) Collimation WG – IR3 passive absorbers 4 June 2012

  2. Outline • - Measurements • 1) Ambient dose equivalent • manual radiation survey (AD6 survey instrument), TS1 25/04/12 • PMI readings • 2) Absorbed dose • high level dosimetry (RPL dosimeters), 2011 (preliminary) • Comparison IR3 vs IR7 • Scaling to nominal operational parameters and comparison to • simulations for IR7 Thanks to: F.Jaquenod, C.Tromel, J.Tummer, H.Vincke Collimation WG – IR3 passive absorbers

  3. IR3 – Ambient dose equivalent (survey 25/04/12) Survey: 25/04/12 Survey: 25/04/12 Collimation WG – IR3 passive absorbers

  4. IR3 – Ambient dose equivalent (survey 25/04/12) Collimation WG – IR3 passive absorbers Survey: 25/04/12 Survey: 25/04/12

  5. IR3 – Ambient dose equivalent (PMI readings 31/01/12) 12 µSv/h 6.3 µSv/h 5.1 µSv/h 6.5 µSv/h Collimation WG – IR3 passive absorbers

  6. IR3 – Absorbed dose (2011) 4.2 kGy (LSXL3-19) 5.2 kGy (LSXR3-19) Collimation WG – IR3 passive absorbers

  7. IR3 – Absorbed dose (2011) 1.8 kGy (LSXL3-18) 1.8 kGy (LSXR3-18) Collimation WG – IR3 passive absorbers

  8. IR3 – Absorbed dose (2011) 300 Gy (LSXL3-16) Collimation WG – IR3 passive absorbers

  9. IR3 – Absorbed dose (2011) 1.9 kGy (LSXR3-14) 5.2 kGy (LSXL3-13) Collimation WG – IR3 passive absorbers

  10. IR7 – Ambient dose equivalent (survey 25/04/12) Survey: 25/04/12 Survey: 25/04/12 Collimation WG – IR3 passive absorbers

  11. IR7 – Ambient dose equivalent (survey 25/04/12) Survey: 25/04/12 Survey: 25/04/12 Collimation WG – IR3 passive absorbers

  12. IR7 – Ambient dose equivalent (survey 25/04/12) Survey: 25/04/12 Survey: 25/04/12 Collimation WG – IR3 passive absorbers

  13. IR7 – Ambient dose equivalent (survey 25/04/12) Survey: 25/04/12 Survey: 25/04/12 Collimation WG – IR3 passive absorbers

  14. IR7 – Absorbed dose (2011) 10.0 kGy (LSXL7-24) 9.2 kGy (LSXR7-22) Collimation WG – IR3 passive absorbers

  15. IR7 – Absorbed dose (2011) 6.6 kGy (LSXL7-18) 5.6 kGy (LSXR7-18) Collimation WG – IR3 passive absorbers

  16. IR3 vs. IR7 – Absorbed dose D3 (2011) 5.2 kGy (LSXR3-19) 4.2 kGy (LSXL3-19) IR3 9.2 kGy (LSXR7-22) 10.0 kGy (LSXL7-24) IR7 Collimation WG – IR3 passive absorbers

  17. IR3 vs. IR7 – Absorbed dose Q5 (2011) 5.2 kGy (LSXL3-13) 1.9 kGy (LSXR3-14) IR3 5.6 kGy (LSXR7-18) 6.6 kGy (LSXL7-18) IR7 Collimation WG – IR3 passive absorbers

  18. IR7 – Scaling to nominal parameters Dose equivalent rates (μSv/h) Measurements Extrapolations Collimation WG – IR3 passive absorbers

  19. IR7 – Scaling to nominal parameters S.Roesler et al., EDMS 863919 Dose equivalent rates (μSv/h) (about two months cooling) • reasonable agreement for passive absorber • dose rate somewhat lower than predicted for first secondary collimator (due to initial settings?) Collimation WG – IR3 passive absorbers

  20. IR3 – Scaling to nominal parameters Dose equivalent rates (μSv/h) Measurements Extrapolations Collimation WG – IR3 passive absorbers

  21. Summary • measurement results exist from • 1) PMI ionization chambers (ambient dose equivalent) • 2) dedicated radiation surveys (ambient dose equivalent) • 3) HLD (absorbed dose in air) • direct comparison with simulation results for the operational conditions of 2011 not • (yet) available, scaling of measured residual dose rates to nominal operational parameters • indicated rough agreement (within factor 2-5) with simulations for IR7 • measurements show asymmetry between beam 1 and 2 for both IR3 and 7, doses higher • by about a factor of two for beam 1 • residual dose rates higher in IR7 as compared to IR3 (factor of 10 for passive absorber in • in front of D3), ratio between both probably different for number of lost protons due to • different layouts (e.g., number and location of collimators and absorbers) • absorbed doses upstream of D3 and Q5 yokes (at the locations of the dosimeters!) higher • for IR7 (factor of 2-5), conclusions on peak dose requires simulations Collimation WG – IR3 passive absorbers

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